This operation sometimes requires access to the container manager service, which we block in the WebContent process. To avoid these sandbox violations we can find the top privately controlled domain in the UI process and send to the WebContent process.
<rdar://89108256>
Created attachment 455414 [details] Patch
Created attachment 455436 [details] Patch
Created attachment 455494 [details] Patch
Pull request: https://github.com/WebKit/WebKit/pull/1602
Committed 251873@main (fed8a6b4c74b): <https://commits.webkit.org/251873@main> Reviewed commits have been landed. Closing PR #1602 and removing active labels.